JP7171108B1 - nut - Google Patents

Abstract

A nut capable of stably supplying a lubricant to a sliding portion between a nut body and a washer is provided. A nut (7) includes a nut body (11) having a female threaded portion (13) on its inner surface, and a washer (10) arranged rotatably with respect to the nut body (11) on the outer side of one end of the nut body (11). The nut body 11 has a lubricating portion 20 that guides lubricant from the female threaded portion 13 side to the sliding portion between the nut body 11 and the washer 10 . [Selection drawing] Fig. 1

Description

The present invention relates to a nut comprising a nut body and a washer rotatably arranged with respect to the nut body.

2. Description of the Related Art Conventionally, a fastening portion including bolts and nuts is used as a mounting portion for mounting a brake and a disk wheel of a large truck or bus to a hub, or as a mounting portion for mounting a disk wheel of a wheel to a hub.

Recently, a washer-incorporated nut, in which a separate washer is rotatably and integrally crimped to the nut body, has been used as a nut to prevent damage to the bearing surface of the disc wheel and to obtain sufficient axial force. be done. In the case of this washer-incorporated nut, the portions that slide during tightening are the threaded surface between the male threaded portion and the female threaded portion and the sliding surface between the nut body and the washer. It is important to stably secure the necessary fastening force for the reliability of the fastening portion. Therefore, in the case of lubricated tightening specifications, it is essential to apply a necessary and sufficient amount of lubricant to the threaded surface and the sliding surface.

For example, it is known that grooves or depressions capable of holding lubricant are formed on the sliding surface between the nut body and the washer (see, for example, Patent Documents 1 and 2).

Japanese Utility Model Laid-Open No. 5-79029 Japanese Utility Model Laid-Open No. 6-18720

In the case of the washer-incorporated nut as described above, the nut body and the washer are integrally attached by a caulking structure. Since the gap between the nut body and the washer is small, it is often difficult to stably supply lubricant to the sliding surface. This is complicated, and the application of the lubricant to the sliding surface tends to be omitted. In the case of such a structure of a washer-incorporated nut, the seating area is smaller than that of a normal nut, and it slides under high surface pressure. increased risk of occurrence.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a nut capable of stably supplying a lubricant to a sliding portion between a nut body and a washer.

The nut according to claim 1 includes a nut head having a facing surface at one end, an inserting portion projecting from one end of the nut head, and an inner surface extending from the nut head and the inserting portion . a nut body having a female threaded portion , a sliding surface axially facing the opposing surface, and an inner side surface radially facing the insertion portion inserted therein; a washer disposed on the outer side of one end of the nut body so as to be rotatable with respect to the nut body, wherein the nut body engages the female threaded portion as the male threaded portion of the bolt is screwed into the female threaded portion; It has a lubricating portion that guides a lubricant from the side to at least the sliding portion between the nut body and the washer including the facing surface and the sliding surface .

According to a second aspect of the present invention, there is provided the nut according to the first aspect, wherein the greasing portion is a hole penetrating the nut body from the inner surface to the outer surface.

According to a third aspect of the present invention, there is provided the nut according to the first aspect, wherein the greasing portion is a groove formed in one end portion of the nut body from the inner surface to the outer portion.

A nut according to claim 4 is the nut according to any one of claims 1 to 3, wherein a plurality of greasing portions are evenly distributed in the circumferential direction of the nut body.

According to the present invention, the lubricant can be stably supplied to the sliding portion between the nut body and the washer by the greasing portion.

(a) is a cross-sectional view of a nut according to the first embodiment, and (b) is a cross-sectional view of a nut body of the same nut. It is a perspective view of a nut same as the above. It is sectional drawing which shows the use condition of a nut same as the above. (a) is a cross-sectional view of a nut according to a second embodiment, and (b) is a cross-sectional view of a nut body of the same nut.

A first embodiment of the present invention will be described with reference to the drawings.

FIG. 3 shows an example of a wheel support structure 1 for a vehicle. The wheel support structure 1 fixes a brake drum 3 and a disc wheel 4 as objects to be supported to a hub 2 which is a support portion fixed to an axle, for example. Not limited to this, the disc wheel 4 may be fixed to the hub 2 in a vehicle using disc brakes. In this embodiment, examples of the vehicle include a large truck with a gross vehicle weight of approximately 11 tons or more, or a large vehicle (large commercial vehicle) such as a bus with a capacity of 30 passengers or more. The illustrated example shows a state in which the wheel support structure 1 is applied to the rear wheels of the vehicle, and the rear wheels have two disk wheels 4 arranged in parallel in the vehicle width direction (horizontal direction in FIG. 3). , indicates a so-called double tire type in which two tires of the same size are used for each wheel. Not limited to this, the wheel support structure 1 may be applied to single-tire wheels, and may be applied to arbitrary wheels such as front wheels, not limited to rear wheels.

The wheel support structure 1 has bolts 6 and nuts 7 . The bolts 6 are wheel bolts that protrude outward from the side surface of the brake drum 3 and are arranged in a plurality, for example 8 or 10, at equal pitches in the circumferential direction. The bolt 6 is fitted into a fitting hole formed in the hub 2, inserted into a through hole formed in the brake drum 3 and the disc wheel 4, and a nut 7 is screwed onto a male threaded portion 8 at the tip of the bolt. and fixed by tightening with a predetermined torque using a tool such as a torque wrench. As an example, the bolt 6 has a nominal thread size of M22×1.5.

Nut 7 is called a wheel nut. As shown in FIGS. 1( a ) and 3 , the nut 7 includes a washer 10 and a nut body 11 . The nut 7 has a separate washer 10 rotatably arranged on the outside of one end of the nut body 11 . In the illustrated example, the nut 7 is a washer-incorporated nut in which a separate washer 10 is rotatably and integrally assembled to the outer portion of one end of the nut body 11 .

The washer 10 is installed on a planar installation surface, which is the side surface 4a of the disk wheel 4 in this embodiment, to distribute the bearing surface pressure of the nut body 11. As shown in FIG. The washer 10 is formed in the shape of a plain washer having an outer shape larger than that of the nut body 11 . That is, the washer 10 is formed in an annular shape with an open center. The washer 10 has a circular outer surface 10a and an inner surface 10b, and has a cylindrical shape extending in the axial direction. The inner side surface 10b has an enlarged diameter on one end side. Moreover, the washer 10 has a seat surface 10c at one end that faces the side surface 4a and is in close contact with the side surface 4a. The seat surface 10c has a planar shape extending in the direction perpendicular to the axis, and has an outer edge connected to the outer side surface 10a and an inner edge connected to the inner side surface 10b. Further, the washer 10 has a sliding surface 10d, which is a facing surface facing the nut body 11 in the axial direction, at the other end opposite to the bearing surface 10c. The sliding surface 10d may be planar along the direction perpendicular to the axis of the washer 10, or may be inclined with respect to the direction perpendicular to the axis. In the present embodiment, the sliding surface 10d is formed in an inclined surface shape inclined by a predetermined angle, for example, 15°, toward the other end side (the upper side shown in FIG. 1A) with respect to the direction perpendicular to the axis. The sliding surface 10d has an inner edge portion connected to the inner side surface 10b and an outer edge portion connected to the end surface 10e. The end face 10e is continuous with the outer side face 10a at its outer edge. In the illustrated example, the end surface 10e is formed in an inclined surface shape that inclines toward the one end portion side (lower side shown in FIG. 1(a)) with respect to the direction perpendicular to the axis. The end surface 10e is located outside the nut body 11 and is a surface that does not face the nut body 11 in the axial direction.

The nut body 11 is formed in a cylindrical shape having a female threaded portion 13 on the inner surface thereof to be screwed with the male threaded portion 8 of the bolt 6 . The nut body 11 has a nut head 15 adjacent the washer 10 . The nut head 15 is a portion exposed to the washer 10 when the nut 7 is screwed onto the bolt 6 . As shown in FIG. 2, the outer surface 15a of the nut head 15 has a hexagonal shape. In the present embodiment, the outer surface 15a has a hexagonal shape that is inscribed or substantially inscribed in the outer shape of the sliding surface 10d of the washer 10. As shown in FIG. One end of the nut head portion 15 forms a sliding surface 15b that faces the sliding surface 10d of the washer 10 in the axial direction. The sliding surface 15b may be planar along the direction perpendicular to the axis of the nut body 11, or may be inclined with respect to the direction perpendicular to the axis. In the present embodiment, the sliding surface 15b is inclined at a predetermined angle, for example, 15 degrees, toward the other end side (the upper side shown in FIG. 1(a)) with respect to the direction perpendicular to the axis of the nut body 11. As shown in FIG. The outer edge of the sliding surface 15b is continuous with the outer surface 15a. The sliding surface 15b and the sliding surface 10d are sliding portions that slide against each other when one of the washer 10 and the nut body 11 rotates relative to the other.

An insertion portion 17 to be inserted into the washer 10 extends from one end portion of the nut head portion 15 . The nut body 11 is integrally attached to the washer 10 by deforming the insertion portion 17 by caulking deformation or the like so that the diameter of the insertion portion 17 is slightly expanded toward the one end portion side.

The insertion portion 17 is formed to have a smaller outer shape than the nut head portion 15 . The insertion portion 17 is formed in a cylindrical shape that is coaxial or substantially coaxial with the nut head portion 15 . The insertion portion 17 is shorter than the axial length of the washer 10 and arranged so as not to protrude from one end of the washer 10 . An outer side surface 17a of the insertion portion 17 radially faces an inner side surface 10b of the washer 10 . An outer side surface 17 a of the inserting portion 17 is continuous with an inner edge portion of the sliding surface 15 b of the nut head portion 15 . The inner surface 17b of the insert 17 forms a series of surfaces with the inner surface 15b of the nut head 15 .

A greasing portion 20 is formed in the nut body 11 . The lubricating portion 20 is an oil passage that introduces lubricant from the female thread portion 13 side to the sliding portion between the nut body 11 and the washer 10, that is, between the sliding surfaces 15b and 10d. The greasing portion 20 is formed extending radially from the inside to the outside of the nut body 11 . In the present embodiment, the greasing portion 20 is a small-diameter hole that penetrates the nut body 11 from the inner surface to the outer surface. In the illustrated example, the greasing portion 20 is formed so as to radially penetrate the insertion portion 17 . For example, the greasing portion 20 is formed by cutting the nut body 11 with a tool such as a drill or by performing electrical discharge machining. That is, the greasing portion 20 of the present embodiment is formed in a separate process after the outer shape of the nut body 11 is molded with a molding die.

The greasing portion 20 is close to a position where the opening portion 20a, which is the end portion opened to the outer side surface 17a of the nut body 11, is connected to the other end portion of the inserting portion 17, that is, the nut head portion 15. located. That is, the opening 20a faces the sliding surface 15b or is positioned close to the sliding surface 15b. In the illustrated example, the opening 20a is positioned to face the inner surface 10b of the washer 10 .

Preferably, the greasing portion 20 has an opening portion 20b, which is an end portion opened to the internal thread portion 13 in the present embodiment, on the inner surface side of the nut body 11, and has a size of, for example, about 1 to 2 pitches. formed. As an example, the opening 20b is formed to have a diameter of approximately 1 mm to 3 mm. The area of the opening 20b may be equal to or larger than that of the opening 20a. In the illustrated example, the greasing portion 20 is formed in the nut main body 11 in a straight line extending in the axial direction, but is not limited to this, and may be formed so as to be inclined with respect to the axial direction. good too.

In the present embodiment, as shown in FIG. 1B, a plurality of greasing portions 20 are evenly distributed in the circumferential direction of the nut body 11 . In the illustrated example, four greasing portions 20 are formed, and are evenly distributed at 90 degrees in the circumferential direction of the nut body 11 .

For the nut 7, first, the washer 10 and the nut body 11 are formed separately. In the present embodiment, the nut body 11 is shaped like a hexagonal tube to form the greasing portion 20 . After that, the inserting portion 17 of the nut body 11 is inserted into the washer 10, the inserting portion 17 is crimped and deformed to integrally assemble the washer 10 and the nut body 11, and the female thread portion 13 is formed on the inner surface of the nut body 11. Form.

The completed nut 7 is applied with a lubricant to the female threaded portion 13, fitted into the fitting hole of the hub 2, inserted into the through holes of the brake drum 3 and the disc wheel 4, and then attached to the male threaded portion of the bolt 6 to which the lubricant is applied. 8, and the nut body 11 is tightened and fixed with a tool such as a torque wrench.

At this time, according to the present embodiment, since the lubricating portion 20 is formed on the nut body 11, the fluid lubricant applied to the male threaded portion 8 of the bolt 6 is applied to the nut body 11 of the nut 7. Accordingly, it is guided to the sliding portion between the nut body 11 and the washer 10 via the greasing portion 20 . That is, before the nut 7 is tightened and fixed to the bolt 6, a slight gap is formed between the washer 10 and the nut body 11 at the stage before seating, in which the washer 10 and the nut body 11 are rotatable relative to each other. Lubricant applied to the male threaded portion 8 of the bolt 6 is led to this gap by the lubricating portion 20 by utilizing this fact. As a result, it is difficult to directly apply the lubricant from the outside by simply applying the lubricant to the exposed female threaded portion 13 and the male threaded portion 8 of the bolt 6 and tightening the nut 7. Lubricant can be stably supplied between the sliding surfaces 15b and 10d, which are sliding portions between the main body 11 and the washer 10. As shown in FIG.

In particular, in the case of a large vehicle having a large number of large tires, several tens of nuts 7 are attached to each vehicle. Lubricant can be applied to the above-mentioned sliding parts simply by applying lubricant to the female threaded portion 13 and the male threaded portion 8 of the bolt 6, which are easy to apply lubricant, and screwing the nut 7, without the need for complicated work such as lubrication. Since it can be applied, the mounting work of the nut 7 can be performed in a short time.

Further, by making the greasing portion 20 a hole penetrating the nut body 11 from the inner surface to the outer side, it is possible to change or process the mold for molding the nut body 11 from the conventional one. It is possible to form the greasing portion 20 in a post-process by using it as it is without removing it. Therefore, the manufacturing cost of the nut 7 can be suppressed.

Since the plurality of greasing portions 20 are evenly distributed in the circumferential direction of the nut body 11 , the lubricant can be evenly distributed from the plurality of greasing portions 20 to the sliding portion between the nut body 11 and the washer 10 . .

Therefore, the lubrication of the sliding portion between the nut body 11 and the washer 10 can be supplemented, and the necessary fastening force can be stably secured, so that it is particularly effective in preventing the vehicle from derailing due to the nut 7 coming off. big.

Next, a second embodiment of the invention will be described with reference to FIG.

In the nut 7 of the second embodiment, the greasing portion 20 is a groove formed in one end of the nut body 11 from the inner surface to the outer surface. The greasing portion 20 is formed by notching one end portion (lower end portion in FIG. 4A ) of the nut body 11 . The grease supply portion 20 is formed to be recessed in the axial direction and extend in the radial direction.

For example, the greasing portion 20 is formed by molding the nut body 11 . That is, the molding die for the nut body 11 is provided in advance with projections for forming the grease supply portion 20 .

In the present embodiment, the depth of the greasing portion 20 extends over the axial length of the insertion portion 17 . Therefore, the inserting portion 17 is divided into a plurality of inserting pieces 21 in the circumferential direction by the greasing portion 20 .

One or more greasing portions 20 are formed in the circumferential direction of the nut body 11 . Preferably, as shown in FIG. 4B, three or more grease supply portions 20 are formed. In the illustrated example, three greasing portions 20 are formed, and are evenly distributed at 120 degrees in the circumferential direction of the nut body 11 .

Other configurations of the nut 7 according to the second embodiment are basically the same as those of the first embodiment.

For the nut 7, first, the washer 10 and the nut body 11 are formed separately. In the present embodiment, the nut main body 11 is formed with the greasing portion 20 during molding. After that, the inserting portion 17 of the nut body 11 is inserted into the washer 10, the inserting portion 17 is crimped and deformed to integrally assemble the washer 10 and the nut body 11, and the female thread portion 13 is formed on the inner surface of the nut body 11. Form.

The completed nut 7 is applied with a lubricant to the female threaded portion 13, fitted into the fitting hole of the hub 2, inserted into the through holes of the brake drum 3 and the disc wheel 4, and then attached to the male threaded portion of the bolt 6 to which the lubricant is applied. 8, and the nut body 11 is tightened and fixed with a tool such as a torque wrench.

At this time, according to the present embodiment, by having the same configuration as the first embodiment, such as forming the lubricating portion 20 in the nut body 11, the female thread portion 13 and the By simply applying a lubricant to the male threaded portion 8 of the bolt 6 and tightening the nut 7, the lubricant can be stably applied to the sliding portion between the nut body 11 and the washer 10, which is difficult to apply directly from the outside. It is possible to obtain the same effects as those of the first embodiment, such as being able to supply the same.

In addition, by forming the greasing portion 20 as a groove portion formed in one end portion of the nut body 11 from the inner surface to the outer side, the greasing portion 20 is formed by the mold for molding the nut body 11 when the nut body 11 is molded. 20 can be molded. Therefore, a separate step for forming the greasing portion 20 is not required, and the nut 7 can be formed in a short time with high accuracy.

Furthermore, since the plurality of greasing portions 20 are evenly distributed in the circumferential direction of the nut body 11, the lubricant can be evenly distributed from the plurality of greasing portions 20 to the sliding portion between the nut body 11 and the washer 10. can be done. Further, by forming three or more greasing portions 20 in the circumferential direction of the nut body 11 , the cylindrical inserting portion 17 is divided into three or more inserting pieces 21 by the greasing portions 20 . Therefore, when assembling the nut body 11 to the washer 10, when the inner insertion portion 17 is caulked so that the diameter is slightly expanded toward the one end side, the inner insertion piece 21 is less than two. Since the insert piece 21 can be easily expanded in the radial direction, the assembly of the nut body 11 and the washer 10 is facilitated.

6 bolt 7 nut
8 male thread
10 washer
10b inner surface
10d sliding surface
11 nut body 13 internal thread
15 nut head
15b facing surface sliding surface
17 interpolation part
20 greasing part

Claims (4)

A nut head having a facing surface at one end, an inserting portion protruding from one end of the nut head, and a female thread formed on an inner surface extending between the nut head and the inserting portion. a nut body;
The nut has a sliding surface axially facing the opposing surface and an inner surface radially facing the insertion portion inserted therein, and is mounted on the outer side of one end of the nut body. a washer rotatably arranged with respect to the body,
The nut body supplies a lubricant from the female threaded portion to the sliding portion between the nut body and the washer, which includes at least the facing surface and the sliding surface, as the male threaded portion of the bolt is screwed into the female threaded portion . A nut, characterized in that it has a leading greasing section. The nut according to claim 1, wherein the greasing portion is a hole penetrating the nut body from the inner surface to the outer surface. The nut according to claim 1, wherein the greasing portion is a groove formed in one end of the nut body from the inner surface to the outer surface. The nut according to any one of claims 1 to 3, wherein a plurality of greasing portions are evenly distributed in the circumferential direction of the nut body.

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